Starting with copper metal, describe how to prepare a pure sample of copper (II) carbonate.

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Explanation:

React excess copper metal with concentrated sulphuric acid or concentrated nitric acid until effervescence stops. Filter to remove excess copper. To the filtrate add either sodium carbonate or potassium carbonate to form copper (II) carbonate, to precipitate copper (II) carbonate wash and dry between filter paper

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.